When we bought our house over 20 years ago, the paint in our garage was peeling. Since then, we have sc****d what we could and repainted multiple times, to no avail. We’d love some advice on how to get paint to adhere.

Details:
• The walls and ceiling are drywall, which were not primed originally, but were primed at some point when we were exploring ideas as to why the paint would not adhere.
• The walls were last painted in 2007 with Duron Everlast interior Alkyd / Oil.
• Our dryer vents into the garage (and no, there’s now good way to vent it elsewhere).
• The paint peels whether or not we open the garage door when we run the dryer.
• The drywall does not appear to be troubled by mold or mildew.

The latest suggestion was to put new drywall over the old and to paint it with exterior paint. This was based on the assumption that the current drywall had somehow become saturated with moisture. There are no obvious signs that this is the case.

I’d like for folks to weigh in on whether applying new drywall is necessary. If so, what type of drywall should we use? And whether or not we use new drywall, how much would scraping, priming, and painting with an exterior paint move us toward a successful outcome?

Any other suggestions would be most welcome.